Verification of Time Information transmitted by Time Signals or Time Telegrams
First Claim
1. A method for verification of time information from time data modulated on one or more continuous carrier signals, comprising:
- receiving a first time signal or telegram with a first reference time;
receiving a second time signal or telegram with a second reference time which follows the first reference time in time;
calculating a target time interval between the first time information and the second time information from the time data contained in the received first and second time signal or telegram or from the preceding verified time information and the second time signal or telegramdetermining a reference time interval by counting of periods of the received signal within the actual time interval between the first and second reference timecomparing the target time interval with the reference time interval; and
outputting an error signal, if the deviation determined by the comparison surpasses a stipulated tolerance value.
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Abstract
A method is proposed for verification of time data from a time signal modulated on a continuous carrier signal with steps to receive a first time signal with a first reference time, to receive a second time signal with a second reference time, which follows the first reference time in time, for calculation of the target time interval lying between the reference times from the time data contained in the received time signal, to determine a time interval and determine a reference time interval, using counting of periods of the continuous carrier signal within the time interval, for comparison of the target time interval with the reference time interval and to send an error signal, if the deviation determined by the comparison surpasses a stipulated tolerance value.
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Citations
20 Claims
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1. A method for verification of time information from time data modulated on one or more continuous carrier signals, comprising:
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receiving a first time signal or telegram with a first reference time; receiving a second time signal or telegram with a second reference time which follows the first reference time in time; calculating a target time interval between the first time information and the second time information from the time data contained in the received first and second time signal or telegram or from the preceding verified time information and the second time signal or telegram determining a reference time interval by counting of periods of the received signal within the actual time interval between the first and second reference time comparing the target time interval with the reference time interval; and outputting an error signal, if the deviation determined by the comparison surpasses a stipulated tolerance value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device for providing a remotely synchronized verified time base, the device comprising:
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one or Receiver-Frontend for receiving one or more signals with modulated time signals or time telegrams; one or more Frame-Synchronization Units to extract time signals or time telegrams from the one or more demodulated received signals and to mark a reference time interval; one or more Decoders to decode the time data from the time signal or time telegram; one or more Reference-Time-Interval-Measurement Unit to count the periods of the received signal. The counting of periods of the received signal is controlled by the marks of the Frame-Synchronization Unit;
for different states of the modulation scheme different counters are used;
the counted periods are used to calculate the reference time interval;one or more Target-Time-Interval-Calculation Units to calculate a target time interval lying between time information from time data contained in the received time signals or time telegrams; one or more Time-Interval-Comparison Units to compare the target time interval with the reference time interval and to send an error signal, if the deviation determined by the comparison exceeds a stipulated tolerance value; one or more Control Units to forward the trustworthy time information and process the error handling; one Time-Synchronization Units to process one or more trustworthy time information for evaluation and optimization;
the output is the verified time information delivered to application processes, e.g. actuators. - View Dependent Claims (10, 11, 12, 13)
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14. An electronic control system for synchronizing a time base comprising:
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a Receiver-Frontend Unit for receiving a sequence of time signals or time telegrams modulated on a carrier signal, having a first output for outputting a sequence of data, each data sequence containing one of the demodulated time signals or time telegrams and a second output for outputting an output signal allowing to count the periods of the received signal. The second output can be given in an analog or digital representation. a Frame-Synchronization Unit being coupled to the first output, which extracts the time signal or time telegram from the first output of the Receiver-Frontend Unit and determines the reference time of the time signal or telegram. a Reference-Time-Interval-Measurement Unit being coupled to the second output of the Receiver-Frontend Unit, wherein the Frame-Synchronization Unit is coupled to a control input of the Reference-Time-Interval-Measurement Unit for applying a start signal upon recognition of a first reference time of a first time signal or telegram in response to which the Reference-Time-Interval Unit starts counting the periods of the received signal and for applying a stop signal upon recognition of a second time reference of the next succeeding valid time signal or telegram in response to which the Reference-Time-Interval-Measurement Unit stops counting the periods of the second output of the Receiver-Frontend Unit, the Reference-Time-Interval-Measurement Unit being configured to calculate the actual reference time interval using the counted periods and a predetermined frequency or frequencies of the carrier or received signal, wherein the Reference-Time-Interval-Measurement Unit has an output for outputting the actual reference time interval signal being representative of the calculated actual reference time interval, a decoder for decoding the demodulated time signals or time telegrams to extract the time information, a Target-Time-Interval-Calculation Unit for a calculation of a target time interval between the time information received with the first one of the time signals or telegrams and a second time information received with the second one of the time signals or telegrams and for providing a target time interval signal being representative of the calculated target time interval, a Time-Interval-Comparison Unit for receiving the reference time interval signal from the Reference-Time-Interval-Measurement Unit and the target time interval signal from the Target-Time-Interval-Calculation Unit, the Time-Interval-Comparison Unit being adapted for calculating a difference between the time reference interval and the target time interval and for comparing the difference to a threshold value, wherein the Time-Interval-Comparison Unit outputs the actual time information and a confidence signal being expressive of the correctness of the actual time provided that the difference is smaller than the threshold, wherein the time base is synchronized using the target-time interval that is output by the target-time calculation unit only if the confidence signal is output by the time interval comparison unit. Optional additional information can be output, e.g. the target time interval. A Control Unit for processing and forwarding the output of the Time-Interval-Comparison Unit and error handling, whereby errors can be generated from all other units. Control Unit can monitor the sequence of confidence values to detect trials of clock manipulation. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification